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fluidized-bed furnaces

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Published: 01 October 2014
Fig. 7 Schematic showing principle of the fluidized-bed furnace. (a) Initially, the gas flows upward through the permeable base to agitate the particles as the pressure is gradually increased. (b) Eventually, the gas flow is sufficient to lift the small particles of refractory materials More
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Published: 01 October 2014
Fig. 44 Percent NH 3 dissociation vs. temperature in a fluidized-bed furnace. Source: Ref 54 More
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Published: 30 September 2014
Fig. 12 Fluidized-bed furnace with external heating by electrical resistance elements and recirculation of fluidizing gas. 1, pivoting cover in two parts; 2, insulation; 3, refractory material; 4, fluidized bed; 5, resistance elements; 6, filter; 7, refractory material; 8, gas inlet; 9, filter More
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Published: 30 September 2014
Fig. 13 Externally gas-fired fluidized-bed furnace with self-regenerative burners. 1, retort; 2, heat-exchange chamber; 3, refractory material; 4, insulation; 5, burner No. 1; 6, burner No. 2; 7, reversing valve; 8, filter; 9, cover More
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Published: 30 September 2014
Fig. 14 Electrothermal fluidized-bed furnace of graphite More
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Published: 30 September 2014
Fig. 15 Controlled-atmosphere fluidized-bed furnace heated by submerged combustion. 1, burner; 2, combustion tube; 3, tube through which combustion gases and particles rise; 4, particle separators; 5, heat exchanger; 6, gas recycle compressor for fluidization; 7, distributor plate; 8, parts More
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Published: 30 September 2014
Fig. 16 Gas-fired fluidized-bed furnace with internal combustion. 1, insulating lagging; 2, refractory material; 3, air and gas distribution box; 4, fluidized bed; 5, parts to be treated More
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Published: 01 December 1998
Fig. 7 Fluidized-bed furnace with external heating by electrical-resistance elements. (a) Pivoting cover. (b) Insulating lagging. (c) Refractory material. (d) Fluidized bed. (e) Resistance elements. (f) Intake for fluidizing gas (air or nitrogen). (g) Parts to be treated More
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005927
EISBN: 978-1-62708-166-5
... combustion heating can be used to achieve the heat input for a fluidized bed. The article also describes the operations, design considerations, and applications of fluidized-bed furnaces in heat treating. Thermochemical surface treatments, such as carburizing, carbonitriding, nitriding, and nitrocarburizing...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005958
EISBN: 978-1-62708-168-9
... Abstract This article provides a detailed discussion on the heating equipment used for austenitizing, quenching, and tempering tool steels. These include salt bath furnaces, controlled atmosphere furnaces, fluidized-bed furnaces, and vacuum furnaces. The article discusses the types of nitriding...
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Published: 30 September 2014
Fig. 5 Relative heat-transfer rates. Heating rates for 16 mm (0.6 in.) diameter steel bars in lead, in salt, in a fluidized-bed furnace, and in a conventional furnace. Source: Ref 3 More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003198
EISBN: 978-1-62708-199-3
...), and fluidized-bed equipment (external-resistance-heated fluidized beds). It describes various auxiliary equipment used in cold-wall furnaces, namely, heating elements and pumping systems. Five types of heat-resistant alloys are used for furnace parts, trays, and fixtures: Fe-Cr alloys, Fe-Cr-Ni alloys, Fe-Ni-Cr...
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Published: 30 September 2014
Fig. 7 Typical dependence of the heat-transfer coefficient on gas velocity in a fluidized-bed furnace More
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Published: 30 September 2014
Fig. 6 Recovery rates for 25 mm (1 in.) diameter steel parts in a 0.3 m 3 (10 ft 3 ) fluidized-bed furnace More
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005992
EISBN: 978-1-62708-166-5
... furnaces for tempering operations typically ranging from 100 to 750 °C (212 to 1380 °F) ( see Table 2 ). Fluidized bed furnaces are not only more energy-efficient than convection furnaces but also exhibit heat transfer efficiency similar to salt baths and lead pots, without the health and environmental...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005230
EISBN: 978-1-62708-187-0
..., fluidizing agent, bed material, and so on. The relative cooling rates in various furnaces at the surface and center of a specimen are shown in Fig. 1 , respectively. Fig. 1 Relative cooling rates (°C/s) between 900 and 750 °C (1650 and 1380 °F) in various quenching media for a bar with maximum cross...
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Published: 01 October 2014
Fig. 9 Schematic of an indirectly heated fluidized-bed heat treating furnace. The gas enters the furnace from the supply line on the bottom left. Source: Ref 3 More
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005957
EISBN: 978-1-62708-166-5
... safety requirements of these furnaces. batch-type furnaces ceramic fibers continuous-type furnaces fluidized-bed furnaces heat exchangers heat treating furnaces salt bath furnaces FURNACES ARE ONE OF THE MOST VERSATILE TYPES of industrial appliances that span many different areas of use...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005794
EISBN: 978-1-62708-165-8
... to it. The use of steam or water vaporization as an additive to the bed necessitates that the bed be operated well above the vaporizing temperature of water. A cheap and simple way to create a nonoxidizing bed atmosphere is to use cooled exhaust gas from a combustion furnace. Fluidization Velocity...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005773
EISBN: 978-1-62708-165-8
.... It details the growth process and nucleation process of carbide and nitride coatings formed on the metal surface. The article discusses the advantages, disadvantages, and characteristics of the various coating processes, including high-temperature salt bath carbide coating, high-temperature fluidized-bed...